What's the screw driver for the M3 screw?
For example, M16-2X60 means metric threads. He said the specific meaning is the nominal diameter of screw is 16MM, pitch 2MM, length of 60MM, such as: 1/4 20X3/4 says is the imperial thread, his specific meaning is the nominal diameter of 1/4 inch screws (=25.4MM inch), there are 20 teeth in an inch in length, 3/4. In addition to the US made screws words in the general said behind inch screw with UNC and UNF, which is the difference between American crude and unf.
Metric screw thread is MM (mm), and its sharp angle is 60 degrees. Thread and thread are in inches. Thread tooth angle is 60 degrees, and the thread tooth angle of 55 degrees. Because of the difference of measurement units, the methods of expressing various threads are not the same.
